Balance board



FIG. 1 is a perspective view of a balance board showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

In the drawings, the dash-dot-dash broken line showing of a ball depicts environment and forms no part of the claim; the evenly-spaced lines represent boundaries of the claimed design and form no part thereof. 

CLAIM The ornamental design for a balance board, as shown and described. 